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3, 6, 10, 21, 63, 227, 891, 3876, 17790, 85536, 424926, 2169376, 11312838, 60065901, 323746095, 1767667332, 9760149468, 54422364834, 306101712771, 1735044593418, 9902940693084, 56876247586827, 328516343529525, 1907316302027081, 11125942281844011, 65182572852807465
(列表;图表;参考;听;历史;文本;内部格式)
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